I had coffee with a friend on Monday, and he told me about walking desks. The basic idea is that you have a treadmill under your desk, and you walk really slowly (less than one mile per hour) while you work. Apparently, people report losing weight really easily, once so much of their sedentary work day is turned a little bit more active. 

(See the links on the sidebar of the above-linked blog, or start with this article.) 

Personally, I was excited by the thought of *not* sitting all day. The opportunity to keep the legs moving, to keep the blood flowing, to avoid the progressive tightness in the hips that seems to plague desk workers everywhere... what a great thing!

I would love to hear from people who have tried this. I might just consider trying to create one at some point...